Geico266
Well Known Member
I was flying near KC the other day and wanted to make sure I did not bump the bottom of "B" space. So I made sure I had the baro reading of 30.43 set in both the glass and the standard round altimeters. Both read 2,300'MSL and life was good. Then I decided to check the reading on the hand heald 496 and it was 2130' MSL (approx). That is 170' difference. The difference seems to be the tempurature being colder than the standard 59F.
Here come the thinking part. The GPS WAAS is much more accurate than the altimeter reading adusted for pressure, but we use this technology in everyone's plane and we know it is not accurate. Why not compensate it for tempurature also and be accurate with the GPS?
When I landed all 3 sources were dead on the field elevation of 1,500'MSL.
Just an interesting observation.
Here come the thinking part. The GPS WAAS is much more accurate than the altimeter reading adusted for pressure, but we use this technology in everyone's plane and we know it is not accurate. Why not compensate it for tempurature also and be accurate with the GPS?
When I landed all 3 sources were dead on the field elevation of 1,500'MSL.
Just an interesting observation.